A gravity bong, also known as a geeb, is a simple device used to smoke cannabis. It is made from two plastic bottles, a socket, and a bowl. The smoke is created by burning the cannabis in the bowl, which is then pulled into the bottom bottle by gravity. The user then inhales the smoke from the top bottle.
Gravity bongs are popular because they are easy to make and use, and they can produce a large amount of smoke. However, they can also be dangerous, as they can cause users to inhale harmful toxins. It is important to use caution when using a gravity bong, and to be aware of the risks involved.